Java Portlet Specification: Difference between revisions

Revision as of 03:02, 24 September 2018

Latest revision as of 14:18, 21 March 2024

(29 intermediate revisions by 19 users not shown)

Line 1:

{{Short description|Technical standard}}

{{more citations needed|date=January 2013}}

TheA '''Java Portlet Specification''' defines a [[design by contract|contract]] between the portlet container[[Portlet|portlets]] and their [[portletPortlet container|containers]]s; andthey provides a convenient [[programming model]] for [[Java (programming language)|Java]] portlet [[Developer (software)|developers]]. It is defined through various Java Specification Requests (JSRs).

== Background ==

'''Portlets''' are [[Pluggable look and feel|pluggable]] [[user interface]] [[software component]]s that are managed and displayed in a [[web portal]], for example an [[enterprise portal]] or a [[web CMS]]. A portlet can [[Web aggregator (disambiguation)|aggregate]] (integrate) and personalize content from different sources within a web page. A portlet responds to requests from a web client with and generates dynamic content.

=== Portlets ===

Portlets produce fragments of [[markup language|markup]] ([[HTML]], [[XHTML]], [[wireless markup language|WML]]) that are aggregated into a portal. Typically, following the [[desktop metaphor]], a portal page is displayed as a collection of non-overlapping portlet windows, where each portlet window displays a portlet. Hence a portlet (or collection of portlets) resembles a [[web-based application]] that is hosted in a [[Web portal|portal]].

{{Main|Portlet}}

A [[portlet]] is a [[Pluggable look and feel|pluggable]] [[user interface]] [[software component]] that is managed and displayed in a [[web portal]]. A portlet responds to requests from a web client with and generates dynamic content. Some examples of portlet applications are [[e-mail]], [[weather forecasting|weather reports]], [[discussion forum]]s, and [[news]].

==== Portlet containers ====

Some examples of portlet applications are [[e-mail]], [[weather forecasting|weather reports]], [[discussion forum]]s, and [[news]].

A portlet is managed by a [[portlet container]], which runs [[portlet]]s and provides them with the required runtime environment. A portlet container receives requests from the portal to execute requests on the portlets hosted by it.

== Specifications ==

A portlet is managed by a [[portlet container]]. Portlet standards are platform independent [[application programming interface]]s that are intended to enable [[software developer]]s to create portlets that can be [[plug-in (computing)|plugged into]] any portal supporting the standards. An example is the Java Portlet Specification. A Java portlet resembles a Java [[Servlet]], but produces fragments rather than complete documents, and is not bound by a [[URL]]. A Java Portlet Specification (JSR) defines a [[design by contract|contract]] between portlets and the portlet container. JSRs provides a convenient programming model for Java portlet developers.

=== JSR 168 ===

A '''portlet container''' runs [[portlet]]s and provides them with the required runtime environment. A portlet container contains portlets and manages their life cycles. It also provides persistent storage mechanisms for the portlet preferences. A portlet container receives requests from the portal to execute requests on the portlets hosted by it. A portlet container is not responsible for aggregating the content produced by the portlets; the portal itself handles aggregation. A portal and a portlet container can be built together as a single component of an application suite or as two separate components of a portal application.

== JSR 168 ==

The Java Portlet Specification V1.0 was developed under the [[Java Community Process]] as Java Specification Request '''JSR 168''', and released in its final form in October 2003.<ref>{{cite web|url=http://www.jcp.org/en/jsr/detail?id=168|title=JSR 168|publisher=JCP}}</ref>

The Java Portlet Specification V1.0 introduces the basic portlet programming model with:

* two phases of action processing and rendering in order to support the [[Model-View-Controllermodel–view–controller|Model–View–Controller]] pattern.

* portlet modes, enabling the portal to advise the portlet what task it should perform and what content it should generate

* window states, indicating the amount of portal page space that will be assigned to the content generated by the portlet

Line 23 ⟶ 26:

* Portal development as a way to integrate the different web-based applications for supporting deliveries of information and services.

==== Portlet Catalog ====

* Initially Java portal vendors had their own portlet development framework thus those portlets were confined to specific portal servers and couldn't be deployed to the rest of the Java portals. After JSR 168 inception, Java portlets may be deployed on any Java portal servers adhering to JSR 168 specifications.

* A Portlets Catalog is a set of portlets that are ready-to-use components for enterprise portals. For those who want to adopt portals certainly need many and variety of portlets to deploy and run. Here Portlets catalog are of use.

* A JSR 168 portlets catalog makes sure that portlets under this catalog may run on any standards–compliant Java portal server. Types of portlet solution (vertical domains and technology) like collaboration, social networking, community, content management, utility, calendaring, HRM all are available in these catalogs.

* There are many open source and commercial Portlets Catalog available but JSR 168 based solutions are rare.

* JSR 168 specifications offer suitability to the developers to reuse the code to maintain a set of JSR 168 compliant portlets. For deployers, it's easy to keep a single set of solution and deploy it on many.

=== JSR 286 ===

A Portlets Catalog is a set of portlets that are ready-to-use components for enterprise portals. For those who want to adopt portals certainly need many and variety of portlets to deploy and run. Here Portlets catalog are of use.

'''JSR-286''' is the Java Portlet specificationSpecification v2.0 as developed under the [[Java Community Process|JCP]] and created in alignment with the updated version 2.0 of [[Web Services for Remote Portlets|WSRP]]. It was released in June 2008.<ref>{{cite web | url = http://www.jcp.org/en/jsr/detail?id=286 | title = JSR 286: Portlet Specification 2.0}}</ref> It was developed to improve on the short-comings onof the version 1.0 of the specification, JSR-168. Some of its major features include:<ref>

A JSR 168 portlets catalog makes sure that portlets under this catalog may run on any standards–compliant Java portal server. Types of portlet solution (vertical domains and technology) like collaboration, social networking, community, content management, utility, calendaring, HRM all are available in these catalogs.

There are many open source and commercial Portlets Catalog available but JSR 168 based solutions are rare.

JSR 168 specifications offer suitability to the developers to reuse the code to maintain a set of JSR 168 compliant portlets. For deployers, it's easy to keep a single set of solution and deploy it on many.

== JSR 286 ==

'''JSR-286''' is the Java Portlet specification v2.0 as developed under the [[Java Community Process|JCP]] and created in alignment with the updated version 2.0 of [[Web Services for Remote Portlets|WSRP]]. It was released in June 2008.<ref>{{cite web | url = http://www.jcp.org/en/jsr/detail?id=286 | title = JSR 286: Portlet Specification 2.0}}</ref> It was developed to improve on the short-comings on version 1.0 of the specification, JSR-168. Some of its major features include:<ref>

{{cite web | last = Hepper | first = Stefan | title = What's new in the Java Portlet Specification V2.0 (JSR 286)? | publisher = IBM | date = 18 March 2008 | url =http://www.ibm.com/developerworks/websphere/library/techarticles/0803_hepper/0803_hepper.html }}</ref>

* Inter-Portlet Communication through events and public render parameters

* Serving dynamically generated resources directly through portlets

Line 44 ⟶ 41:

* Introduction of portlet filters and listeners

=== JSR 362 ===

'''JSR-362''' is the Java Portlet specificationSpecification v3.0 and was released in April 2017.<ref>{{cite web | title = JSR 362: Portlet Specification 3.0 | url = https://www.jcp.org/en/jsr/detail?id=362}}</ref> Some of its major features include:<ref>

'''JSR-362''' is the Java Portlet specification v3.0 and was released in April 2017.<ref>{{cite web | title = JSR 362: Portlet Specification 3.0 | url = https://www.jcp.org/en/jsr/detail?id=362}}</ref> Some of its major features include:<ref>

{{cite web | last = Nicklous | first = Martin (Scott) | title = Portlet Specification 3.0 is Here! | publisher = IBM | date = September 2016 | url = https://static.rainfocus.com/oracle/oow16/sess/1462801563632001pOv8/ppt/JSR362-JavaOne-2016a.pdf }}</ref>

* Resource Dependencies

Line 53 ⟶ 49:

* Servlet 3.1 Alignment

* Portlet Hub & XHR IPC

* FacesBridge Integration via [httpJSR 378<ref>{{Cite web|url=https://www.jcp.org/en/jsr/detail?id=378|title=The Java Community Process(SM) Program - JSRs: Java Specification Requests - detail JSR# 378]|website=www.jcp.org}}</ref>

==See also==

* [[List of enterprise portal vendors]]

* [[Web Services for Remote Portlets]] (WSRP)

* Java Portlet Specification

* [[JSR 168| JSR 168 (Java Portlet Definition Standard)]]

== References ==

Line 65 ⟶ 59:

== External links ==

* [http://www.jcp.org/en/jsr/detail?id=301 JSR 301] (Portlet 21.0 Bridge for JSFJavaServer Faces 1.2 Specification)

* [http://www.jcp.org/en/jsr/detail?id=168 JSR 168] (Version 1.0 of the Java Portlet Specification)

* [http://www.jcp.org/en/jsr/detail?id=286 JSR 286] (Version 2.0 of the Java Portlet Specification)

* [http://www.jcp.org/en/jsr/detail?id=362 JSR 362] (Version 3.0 of the Java Portlet specification)

* [http://www.jcp.org/en/jsr/detail?id=301 JSR 301] (Portlet 2.0 Bridge for JSF 1.2 Specification)

* [http://www.jcp.org/en/jsr/detail?id=329 JSR 329] (Portlet 2.0 Bridge for JSF 1.2 Specification)

* [http://www.jcp.org/en/jsr/detail?id=378 JSR 378] (Portlet 3.0 Bridge for JSF 2.2 Specification)

* [http://portals.apache.org/pluto/ JSR 168 Open Source Reference Implementation at Apache]

* [https://web.archive.org/web/20060110193512/http://community.java.net/portlet/ Open source JSR 168/WSRP community] at https://web.archive.org/web/20100613131851/http://www.java.net/

* [http://research.nesc.ac.uk/rapid/ Rapid Portlet Generator] for generating JSR 168-compliant portlets

{{Web interfaces}}

* [http://soap-portlet.sourceforge.net/ Dynamic SOAP Portlet], for dynamic integration of [[SOAP]] services in JSR-168 portals

[[Category:Java enterprise platform|Portlet specification]]

[[Category:Java specification requests|Portlet specification]]

[[Category:Web portals]]

[[Category:AMD]]

[[Category:AMD microprocessors]]

[[Category:AMD technologies]]